21442356548897 has 2 divisors, whose sum is σ = 21442356548898. Its totient is φ = 21442356548896.

The previous prime is 21442356548867. The next prime is 21442356548903. The reversal of 21442356548897 is 79884565324412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14182786128016 + 7259570420881 = 3766004^2 + 2694359^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21442356548897 is a prime.

It is not a weakly prime, because it can be changed into another prime (21442356548867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721178274448 + 10721178274449.

It is an arithmetic number, because the mean of its divisors is an integer number (10721178274449).

Almost surely, 2^{21442356548897} is an apocalyptic number.

It is an amenable number.

21442356548897 is a deficient number, since it is larger than the sum of its proper divisors (1).

21442356548897 is an equidigital number, since it uses as much as digits as its factorization.

21442356548897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 464486400, while the sum is 68.

The spelling of 21442356548897 in words is "twenty-one trillion, four hundred forty-two billion, three hundred fifty-six million, five hundred forty-eight thousand, eight hundred ninety-seven".